MHD Heat Transfer in W-Shaped Inclined Cavity Containing a Porous Medium Saturated with Ag/Al2O3 Hybrid Nanofluid in the Presence of Uniform Heat Generation/Absorption

Abstract

<jats:p>In this paper, a 2D numerical study of natural convection heat transfer in a W-shaped inclined enclosure with a variable aspect ratio was performed. The enclosure contained a porous medium saturated with Ag/Al2O3 hybrid nanofluid in the presence of uniform heat generation or absorption under the effect of a uniform magnetic field. The vertical walls of the enclosure were heated differentially; however, the top and bottom walls were kept insulated. The governing equations were solved with numerical simulation software COMSOL Multiphysics which is based on the finite element method. The results showed that the convection heat transfer was improved with the increase of the aspect ratio; the average Nusselt number reached a maximum for an aspect ratio (AR) = 0.7 and the effect of the inclination was practically negligible for an aspect ratio of AR = 0.7. The maximum heat transfer performance was obtained for an inclination of ω = 15 and the minimum is obtained for ω = 30 . The addition of composite nanoparticles ameliorated the convection heat transfer performance. This effect was proportional to the increase of Rayleigh and Darcy numbers, the aspect ratio and the fraction of Ag in the volumetric fraction of nanoparticles.</jats:p>

Free convection and thermal radiation of a nanofluid inside an inclined L‐shaped microelectronic module under the Lorentz forces' impact

“…In the last few years, the study of heat transfer has been done inside cavities of different shapes such as U‐shaped, 31 T‐shaped, 32 C‐shaped, 33 L‐shaped, 34 and incinerator‐shaped, 35 the results obtained by these studies show that convection heat flow is enhanced by using a nanofluid instead of basic fluid, in addition, the results have shown that aspect ratio of cavities presents a principal factor on the convection heat flow. The convection heat flow inside cavities containing porous media saturated with nanofluid under magnetic forces effect has been examined by Massoudi et al, 36 Izadi et al, 37 and Zeeshan et al, 38 they pointed out that convection heat flow rises by increasing the Darcy number. Other studies such as Teamah and El‐Maghlany 39 and Mliki et al 40 has been done to examine the effect of uniform heat generation or absorption on the heat transfer performance inside cavities, they pointed out that presence of uniform heat generation improves convective flow, however, the presence of uniform heat absorption reduces it.…”

Numerical analysis of magneto-natural convection and thermal radiation of SWCNT nanofluid inside T-inverted shaped corrugated cavity containing porous medium

“…The effective heat capacitance and thermal dilation coefficient of nanofluid models (Massoudi et al , 2020a, 2020b) are defined as follows: …”

“…The magnetic field poses a significant factor that affects the efficiency of heat transfer in various industrial and engineering domains. Much work has therefore been done to investigate the influence of the magnetic field on heat transfer efficiency in cavities of various shapes such as F-shaped (Yadollahi et al , 2017), T-shaped (Hussein et al , 2016; Selimefendigil and Öztop, 2020a), H-shaped (Li et al , 2019; Rahimi et al , 2018), C-shaped (Makulati et al , 2016; Haq et al , 2018; Mliki et al , 2017), W-shaped (Massoudi et al , 2020a), L-shaped (Zhang et al , 2020; Ahmed et al , 2020), U-shaped (Selimefendigil and Öztop, 2020b; Ali et al , 2020), containing saturated porous media nanofluids. The results obtained from these works have shown that convective flow inside cavities increases by increasing the aspect ratio of Darcy number and cavity and decreases with the impact of Lorentz forces induced by magnetic field application.…”

A three-dimensional thermal analysis for cooling a square Light Emitting Diode by Multiwalled Carbon Nanotube-nanofluid-filled in a rectangular microchannel

“…The nanofluid passing through the microchannel to cool the heat sink being varied such as: air, 35 nitrogen air-gas, 36 a permeable membrane. 37 Due to their highly efficient conductivity, the use of nanofluids to control heat transfer and/or cooling system in various applications is considered among the effective solutions for several researchers such as: Massaoudi et al, [38][39][40][41] Ben hamida et al, [42][43][44][45] and Ben Jaballah et al 46,47 Recent work asserts that MWCNT is among the best to use to improve heat transfer. [48][49][50] Therefore, the three-dimensional analysis of the thermal management of cooling electronic devices is a promising area of research.…”